Finding the Fourth Proportional to 10,456.39, 15,686.51 and 3,436.80

Step by Step Solution

1. Step 1: Write the proportion equation
   10,456.39 : 15,686.51 = 3,436.80 : x
2. Step 2: Convert to fraction form
   10,456.39/15,686.51 = 3,436.80/x
3. Step 3: Cross multiply
   10,456.39x = 15,686.51 × 3,436.80
4. Step 4: Simplify right side
   10,456.39x = 53,911,340.89
5. Step 5: Solve for x
   x = 53,911,340.89/10,456.39
6. Step 6: Final answer
   x = 5,155.83